Workholder for sharpening machines



5,1935. L. STEINER I 2,019,742

WORKHOLDER FOR SHARPENING MACHI NES Filed Nov. 25, 1932 law/52517257 Z 1 W I 25 a away Patented Nov. 5, 1935 UNITED STATES PATENT OFFICE Leo Steiner, Budapest, Hungary Application November 25, 1932, Serial No. 644,183 In Great Britain November 28, 1931 2 Claims.

This invention relates to that type of workholders for sharpening machines in which the work is rotatably mounted on a pivot so that a double-edge blade may present in succession both edges for sharpening without being removed from its position on the pivot. The chief object of the invention is to improve such work-holders so as to meet the requirements of that type of sharpening machines in which the work must have unlimited freedom of movement in its own plane and the work-holder has to weigh upon the blade edge to be sharpened to obtain correct operation of the machine as, for example, in the machine described and claimed in my Patent No. 1,941,- 501, issued January 2, 1934. Other objects of the invention will appear from the following description of two constructional forms of the invention which are illustrated by way of example in the accompanying drawing in which- Fig. 1 is a side View of a constructional form of the invention as seen from the right of Fig. 2, Fig. 2 is an end view of the same constructional form, and Fig. 3 is a side view of a second constructional form.

Referring first to Figs. 1 and 2 of the drawing, 4 is the body of the work-holder which is intended to be guided in a vertical plane between the plane confronting sides of a pair of fixed rails 5 and 5 and which is provided at its lower end with a pair of wings i and 8 forming a clamp for the work piece 5 E! which is in the case illustrated a double-edge flexible razor blade of the wellknown type. Wing l is integral with the body 4 of the holder and wing 8 is hinged at 9 so as to allow to open the clamp which is normally held closed by spring ll. From the inner or clamping surface of wing l projects a peg l2 which in the closed position of the clamp passes through a corresponding hole in wing 8. In the open position of the clamp, the blade H2 is put on the inner or clamping surface of wing l, in the manner known in itself, by passing the peg l2 through the middle hole of the blade so that the blade can pivot freely about the peg.

As the work-holder is intended to weigh upon the lower edge of the blade it) while this edge is sharpened, it is necessary to provide for a second point of support for the holder in order to prevent it from tilting about the peg I2 as a pivot. This second point of support is obtained by means of a roller 13 rotatably mounted upon the free end of an arm i i extending from the top part 01' the holder body 4 above the guide rail 6 on which the roller I3 is rolling during the progress of the holder 4 between the guide rails 5 and 6, the purpose of such progress being described in my Patent No. 1,941,501 referred to above. Free displacement of the blade Ill in its own plane or in the vertical plane passing through its edge l operated on is ensured by the fact that the blade can pivot about peg 52 on the holder and at the same time the whole of the holder together with the blade can pivot about the axis of roller l3.

When the free edge, 1. e. the lower one in the drawing, of the blade H) has been sharpened, the second edge of the blade may be presented for sharpening, without removal of the blade from its holder, by simply turning the blade through degrees around peg 12, the inner faces of the wings being recessed at I5 so as to afford free passage to the blade in its intermediate position indicated by dot and dash lines in Fig. 1.

It will be understood that any further edge of the blade could be presented for sharpening, if desired.

In the constructional form of the work-holder shown in Fig. 3, the second point of support for the holder body l is provided for by clamping in two blades to and It! in one holder, the pegs I 2 and i2 being passed each through the middle hole of a blade. It will be understood that the double clamp 8' is so formed as to hold both blades it and it in one and the same vertical plane in which each blade may pivot or oscillate independently of the other.

It should be understood that the word sharpening as used in the description and claims is intended to include grinding, honingburnishing, polishing and stropping.

What I claim is:

1. A work-holder for use in blade sharpening machines, comprising a pivot adapted so to carry the blade as to enable it to be rotated and thereby present in succession several of its edges for sharpening without being removed from its position on the pivot, a second pivot located with its axis parallel to, and at a substantial distance from, the axis of said first pivot, and a supporting member rotatably mounted on said second pivot, each pivot forming a point of support for the work-holder, about which the work-holder can pivot in the plane to be occupied by the blade on said first pivot.

' 2. A work-holder as claimed in claim 2, where- 50 in the supporting member rotatable on the second pivot is another blade located in the plane to be occupied by the blade on the first pivot.

LEO STEINER. 

